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10.3.4
Delimbing (Fig. 10)
WARNING
Danger of injury!
Many accidents happen during delimbing.
1. Hold the product firmly with both hands and guide
the product in front of your body while sawing.
2. Do not lean too far forward during operation.
3. Never saw off branches when standing on the tree
trunk.
4. Keep an eye on the kick-back area if branches are
tensioned.
Delimbing is the term for removing branches and twigs
from a tree.
• Remove supporting branches only after cutting to
length.
• Tensioned branches must be sawn from the bottom
upwards to prevent the product from jamming.
• When sawing off thicker branches, use the same tech-
nique as for cutting to length.
• Work to the left of the trunk and as close as possible
to the product. If possible, let the weight of the product
rest on the trunk.
• Change your position to cut branches on the other
side of the trunk.
• Branched boughs are cut to length individually.
• When delimbing, leave larger downward branches
that support the tree for the time being. Separate
smaller branches with one cut.
10.3.5
Felling a tree (Fig. 11, 12)
DANGER
Danger of injury!
Sawing and felling work as well as all related work may
only be carried out by specially trained and briefed per-
sons.
DANGER
A lot of experience is needed to fell trees. Only fell trees
if you can handle the product safely. Never use the
product if you feel unsafe.
DANGER
Life-threatening injuries!
–
Never saw fully through the trunk!
–
During felling, only stand to the side of the tree you
intend to fell!
DANGER
Do not fell a tree if a strong or changing wind is blowing,
if there is a risk of property damage or if the tree could
hit electrical lines.
• Ensure that no other people or animals are present in
the work area. The safety distance between the tree
to be felled and the nearest workplace must be 2.5
tree lengths.
• Pay attention to the felling direction: The user must be
able to move safely in the vicinity of the felled tree in
order to be able to cut to length and delimb the tree
easily. The falling tree must be prevented from be-
coming entangled in another tree. Observe the natural
fall direction which depends on the inclination and cur-
vature of the tree, wind direction and number of
branches.
• Small trees with a diameter of 15-18 cm, can usually
be sawn with one cut.
• Always stand above the branch when sawing on
slopes. Ensure that the saw chain does not come into
contact with the ground. After completing the cut, wait
for the saw chain to stop before removing the product.
• Dirt, stones, loose bark, nails, staples and wire must
be removed from the tree.
Delimbing:
• Remove the branches hanging downwards by making
the cut above the branch. Never delimb above shoul-
der height.
Escape route:
• Remove the undergrowth around the tree to ensure
an easy retreat. The escape route should be about
45° behind the planned felling direction.
Cutting the notch cut:
• Place a notch cut in the direction that the tree should
fall.
• Start with the bottom, horizontal cut.
• The cutting depth should be 1/3 of the trunk diameter.
This prevent the saw chain or the guide rail becoming
jammed when placing the second notch cut.
• Now make cut at an angle of about 45° from above
which meets the lower saw cut precisely.
DANGER
Never step in front of a tree that is notched.
Felling cut:
• Perform the felling cut from the other side of the trunk
while standing to the left of the tree trunk and sawing
with the saw chain pulling.
• The felling cut must run horizontal at least 5 cm above
the horizontal notch cut.
• It should be deep enough so that the distance to the
notch cut line is at least 1/10 of the trunk diameter.
• The part of the trunk that has not been sawn through
is called the bar (felling bar).
The bar prevents the tree from turning and falling in
the wrong direction.
Do not saw through the bar.
• As the felling cut approaches the bar, the tree should
begin to fall.
• If it appears that the tree is potentially not falling in the
desired direction or is leaning back and the saw chain
is jammed, stop the felling cut and use wooden, plas-
tic or aluminium wedges to open the cut and move the
tree to the desired fall line.
• If the trunk diameter is greater than the length of the
guide bar, make two cuts.
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